SeaStar Hydraulic Power Steering (Cont.)
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APPLICATION GUIDE: SEASTAR POWER STEERING CYLINDERS
The chart below is only a guide to selecting a steering system. A steering system maker cannot anticipate
all the variables in boat-rudder design that affect steering loads. It is the final responsibility of the boat
designer/builder to specify maximum expected steering loads. If the required information is not available,
contact customer service with rudder dimensions, vessel size and anticipated maximum speed. Boats
over 70 feet should have steering loads reviewed by SeaStar Solutions.
STEERING
RECOMMENDED
FOR
WHEEL
REQUIRES
TUBING/HOSE
MAXIMUM
VESSEL
HELM
TURNS
CYLINDER
DIAMETERS
OUTPUT TORQUE
SIZES
PUMP
Lock to
PART NUMBER(S)
Power
Manual
UP TO:
MODEL
Lock
(stroke, bore ”)
Circuit
Circuit
In.-Lb.
Nm
PLANING HULLS:
up to 65' (20m)
SeaStar 1.7
3.5
HC5801-2 (9” 1.0”)
100R1
5/16”
18,900
2,130
up to 75' (23m)
SeaStar 1.7
4.25
HC5803-2 (11” 1.0”)
100R1
5/16”
23,140
2,610
up to 85' (26m)
SeaStar 1.7
3.5
100R1
5/16”
37,800
4,260
up to 100' (31m)
SeaStar 1.7
4.25
100R1
5/16”
46,280
5,220
up to 110' (34m)
SeaStar 1.7
3.5
HC5805 (9” 2.5”)
100R1
5/16”
33,065
3,736
up to 120' (37m)
SeaStar 1.7
3.5
100R1
5/16”
66,130
7,472
DISPLACEMENT HULLS (STANDARD):
up to 50' (15m)
SeaStar 1.7
3.5
HC5801-2 (9” 1.0”)
100R1
5/16”
18,900
210
up to 60' (18m)
SeaStar 1.7
4.25
HC5803-2 (11” 1.0”)
100R1
5/16”
23,140
260
up to 75' (22m)
SeaStar 1.7
3.5
100R1
5/16”
37,800
420
up to 85' (26m)
SeaStar 1.7
4.25
100R1
5/16”
46,280
520
up to 100' (31m)
SeaStar 1.7
3.5
HC5805 (9” 2.5”)
100R1
5/16”
33,065
3,736
up to 110' (34m)
SeaStar 1.7
3.5
100R1
5/16”
66,130
7,472
DISPLACEMENT HULLS (HEAVY DUTY):
up to 40' (12m)
SeaStar 1.7
3.5
HC5801-2 (9” 1.0”)
100R1
5/16”
18,900
210
up to 50' (15m)
SeaStar 1.7
4.25
HC5803-2 (11” 1.0”)
100R1
5/16”
23,140
260
up to 55' (17m)
SeaStar 1.7
3.5
100R1
5/16”
37,800
420
up to 60' (18m)
SeaStar 1.7
4.25
100R1
5/16”
46,280
520
up to 70' (22m)
SeaStar 1.7
3.5
HC5805 (9” 2.5”)
100R1
5/16”
33,065
3,736
up to 80' (25m)
SeaStar 1.7
3.5
100R1
5/16”
66,130
7,472
NOTE: Theoretical torque about pivot point at 35 degrees articulation with 1,000 PSI (70 BAR) system pressure.
BORE
NOMINAL SHAFT
VOLUME
OUTPUT
TORQUE
PART
DIAMETER
DIAMETER
STROKE
CUBIC IN.
FORCE
(SEE NOTE)
CYLINDER MODEL
NUMBER
Inches (mm)
Inches (mm)
Inches (mm)
(cc)
Ft.-Lbs. (N)
In.-Lb. (Nm)
SINGLE 9" STROKE x1
2.00 (51)
1.00 (25.4)
9 (229)
21.25 (348)
2,946 (13090)
18,900 (2,130)
SINGLE 11" STROKE x1 HC5803-2
2.00 (51)
1.00 (25.4)
11 (280)
25.9 (425)
2,946 (13090)
23,140 (2,610)
SINGLE 9" STROKE x1
2.50 (64)
1.00 (25.4)
9 (229)
37.11 (608)
5,154 (22926)
33,065 (3,736)
TWIN 9" STROKE x2
2.00 (51)
1.00 (25.4)
9 (229)
42.50 (697)
5,892 (26,190) 37,800 (4,260)
TWIN 11" STROKE x2
2.00 (51)
1.00 (25.4)
11 (280)
51.80 (850)
5,892 (26,190) 46,280 (5,220)
TWIN 9" STROKE x2
2.50 (64)
1.00 (25.4)
9 (229)
74.33 (1216)
10,308 (45,852) 66,130 (7,472)
POWER STEERING CYLINDER SPECIFICATIONS:
NOTE: Theoretical torque about pivot point at 35 degrees articulation with 1,000 PSI (70 BAR) system pressure.
STEERING - Inboard (Hydraulic)
